Park Young Jun, Fray Derek J
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, United Kingdom.
J Hazard Mater. 2009 May 30;164(2-3):1152-8. doi: 10.1016/j.jhazmat.2008.09.043. Epub 2008 Sep 21.
Waste printed circuit boards (WPCB) have an inherent value because of the precious metal content. For an effective recycling of WPCB, it is essential to recover the precious metals. This paper reports a promising method to recover the precious metals. Aqua regia was used as a leachant and the ratio between metals and leachant was fixed at 1/20 (g/ml). Silver is relatively stable so the amount of about 98 wt.% of the input was recovered without an additional treatment. Palladium formed a red precipitate during dissolution, which were consisted of Pd(NH(4))(2)Cl(6). The amount precipitated was 93 wt.% of the input palladium. A liquid-liquid extraction with toluene was used to extract gold selectively. Also, dodecanethiol and sodium borohydride solution were added to make gold nanoparticles. Gold of about 97 wt.% of the input was recovered as nanoparticles which was identified with a high-resolution transmission electron microscopy through selected area electron diffraction and nearest-neighbor lattice spacing.
废弃印刷电路板（WPCB）因其所含的贵金属而具有内在价值。为了有效地回收WPCB，回收其中的贵金属至关重要。本文报道了一种回收贵金属的可行方法。采用王水作为浸出剂，金属与浸出剂的比例固定为1/20（克/毫升）。银相对稳定，约98 wt.%的输入量无需额外处理即可回收。钯在溶解过程中形成红色沉淀，其成分为Pd(NH(4))(2)Cl(6)。沉淀量为输入钯量的93 wt.%。采用甲苯液 - 液萃取法选择性地萃取金。此外，添加十二硫醇和硼氢化钠溶液制备金纳米颗粒。约97 wt.%的输入金被回收为纳米颗粒，通过选区电子衍射和最近邻晶格间距，利用高分辨率透射电子显微镜对其进行了鉴定。
